﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace bai3_sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            Rectangle recta = new Rectangle(3, 4);
            Rectangle rectb = new Rectangle();
            Console.WriteLine("recta" + recta.area());
            Console.WriteLine("rectb" + rectb.area());
        }
    }
}
